Brake.



Unites States EDWARD CHARLES FREDERICK OTTO AND EDXVARD CHARLESFREDERICK OTTO, JR., OF HONOR OAK, ENGLAND.

BRAKE.

SPECIFICATION forming part of Letters Patent No. 653,692, dated July 17,1900.

Application filed February 24, 1900. Serial No. 6,425, (No od m To allwhont it may concern.-

Be it known that we, EDWARD CHARLES FREDERICK OTTO and EDWARD CHARLESFREDERICK OTTO, J12, subjects of the Queen of Great Britain, residing atHonor Oak, in the county of Surrey, England, have invented a new anduseful Improvement in Brakes, (for which we have obtained Letters Patentin Great Britain No. 15,503, hearing date the 28th of July, 1899,) ofwhich the following is a full and complete specification.

This invention relates to an improved brake or frictional mechanism forretarding motion applicable to vehicles and machinery of all kinds; andit consists, essentially, of a linked strap or band in the form of achain adapted when quiescenti. 6., when the brake is out of actionto liein contact with and be circumferentially supported by a drum hereinaftercalled the chain drum, which is mounted concentrically with respect to adrum hereinafter called the brake drum, with which the chain engageswhen operative-t'. e., when the brake is in action-the object being toovercome the defects common to brakes of the strap and drum type.

Owing to the link formation of the strap or band,it has no tendency tobecome set or to lose its shape by use, and being supported it cannotcome into accidental contact with the drum when the brake is off.Neither does it, as in the type of brake having spring or elasticstraps, absorb a large amountot' power to overcome its elasticity whenapplying it. Moreover, by causing the end link of the chain, to whichmotion is imparted to apply the brake, to move in the same direction asthe wheel or drum to which the braking or retarding effect is to beapplied the brake acts more or less by inducement, as each link when itis brought into engagement with the brake-drum tends to drag the nextlink into frictional cunlact with the said drum and so on until thewhole strap or band is engaged.

In the accompanyingdrawings,which illustrate, by way of example only,the application of this improved brake to the wheel of a road-vehicle,Figure l is a broken view, in front elevation, partly in section. Fig. 2is a view in sectional side elevation; and Figs. 3 and 4 are brokenviews, in side elevation and plan, respectively, of the linked strap orband.

Referring to the drawings, the chain-drum Bis fixed to the non-rotatingaxle Z or to any adjacent part of the frame of the vehicle concentricwith the wheel to which the braking or retarding effect is to beapplied, and the brake-drum O is fixed to the spokes X of the said wheelconcentrically with the chaindrum B. The one end link a of the strap orband A is attached to the periphery of the chain-drum B by means of aradially-arranged projection a engaging a hole or slot in the peripheryof the said drum, and the other end link ct is connected, by means of atransversely-arranged stud a with a lever \V, pivoted either to thechain-drum B,as shown,or to any convenient adjacent part of the frame ofthe vehicle, the arrangement being such that the movement of the leverWV in one direction expands the linked strap or band A against theinternal surface of the brake-drum C, and the reverse movement contractsthe chain band onto the chain-drum B. Any suitable form of spring, suchas F, may be employed to return the lever W and keep the linked strap orband A in contact with the periphery ofthe chain-drum when the brake isout of operation. The necessary movement to apply the brake may beimparted to the lever W, either directly or indirectly, in any suitablemanner. Vhere the leverage will permit, we prefer to pivot the lever Wat or about the center of the wheel to which the braking or retardingeffect is to be applied. As an alternative construction the brakingeffect may be caused by contracting the linked strap or band A onto thebrakedrum, in which case the chain-drum would be exterior to thebrake-drum.

The linked strap or band A consists of a series of links of metal orother suitable material connected together by transverse pins or rivets,as shown by Figs. 3 and 4, or so shaped that they engage oneanother byhooking. \Vhen the linked strap or band is intended to act by cominginto contact with an internal drum-2'. 6., when it would be in a stateof compression-the ends of the links [00 are preferably so shaped thatthey abut one against the other, as shown, so as to relieve the pins orrivets connecting them of all strain. The links of the strap or band aremade of the same width, and their operative engaging surfaces, whetherit be the outer or inner one, are made of the same curvature as thesurface of the drum with which they are intended to engage, so as toobtain the greatest possible amount of frictional surface. If increasedfrictional resistance is required, it may be obtained either by liningthe brake-drum with leather or other suitable material or by using achain band of such a length that it makes more than oneeomplete turnaround the drum.

The application of this brake to machinery will be apparent from theforegoing without any further description.

\Vhat we claim, and desire to secure by Letters Patent, is-

1. In a brake, the combination with a roadwheel, and a brake-drumrevolving with it; of a non-revoluble supporting-d rum mountedconcentric with the brake-drum, an operating-lever pivoted to thesupporting-drum, and a linked chain band arranged in the space betweenthe said drums and having its ends connected to the said lever andsupportingdrnm respectively, substantially as set forth.

2. In abrake,the combination,with abrakedrum, of a second drum mountedconcentrically with the brake-drum and adapted to support the strap orband when it is out of action with the brake-drum, and a linked chainband formed of a series of metallic links pivoted together and havingtheir operative faces curved to the same radius as the operative face ofthe drum with which the strap or band engages, as set forth.

3. In a brake the combination with a brakedrum, of a second drum mountedconcentrically with the brake-drum and adapted to support the band whenit is out of action with the brake-drum, and a linked chain band formedof aseries of metallic links pivoted together so that their ends abutagainst one another, each link being of the same width and having itsoperative face curved to the same radius as the operative face of thedrum with which the strap or band engages, as set forth.

EDWARD CHARLES FREDERICK OTTO.

EDWARD CHARLES FREDERICK OTTO, JR. Witnesses:

A. KNIGHT CROAD,

W. M. HARRIS.

